I am getting discouraged by posters "making small talk"
And we are largely doing this because, as usual, it is far from clear what actual problem you are trying to solve. The original question is fine as it stands, but with more detail we may be able to offer alternative answers. There may be a perfectly reasonable answer to your real problem, but we cannot giuess what that is. You really need to stop attacking everyone for not providing what you determine is the right answer, and stop and think about the quality of the questions you post here.
su with no arguments runs a shell as root. The password prompt is looking for root's password, not the current user. Similarly su -u bob will prompt for the password for bob. If the current process has root permissions, then no password prompt is
sudo, on the other hand prompts for the current users password. As you probably know, sudo then checks /etc/sudoers to confirm that the current user has permission to run sudo.
So sudo su prompts for the current users password. If that succeeds, then the user is given root permissions and the command su is executed. As the invoking process to su has root permissions, no password prompt is issued, and su starts a root level shell. If you look at your process table, you will see that you have 3 processes now running, sudo, su, bash. Compare that to just sudo bash, or sudo -s, which will only have 2 processes running, namely su and bash.
Can I ask you to "translate" this to English for me ?
QP->start("/bin/sh", QStringList() << "-c" << command);
Sure: call operator<< on the results of calling some unknown function QStringList() and (char *)"-c" and then call operator<< on the results of that with some unknown object command. Then pass that ojbect and (char *)"/bin/bash" to method start on some unknown object QP. What any of this actually does in not known in the context of what you've presented here. I'm guessing it pulls the tail on a elephant at the Bronx Zoo. Its as valid a guess as anything else.
Assuming this goes back to your question about creating a link between /dev/ttyUSB0 and something that looks might be a bluetooth device file (which you've now helpfully removed, so I can't refer to it .. nice), Are you sure that's what you want to do? This would suggest that you have a serial USB dongle (i.e. an RS232 to USB converter) to which you've attached a serial BlueTooth receiver. I don't know if any such beast actually exists. I suspect not, so you're probably going in the wrong direction here.
But a quick perusal of the docs for QProcess, which is what I assume that QP is, doesn't suggest that QP launches a terminal, so is that part of what command does? Perhaps you'd be better off looking into how to use sudo to let a user launch a given command without having to enter a password? https://askubuntu.com/a/159009 Alternatively, you could change the ownership of the executable to a user with sufficient access to perform whatever task it is you're trying to do, and then set the suid bits on the executable so the executable runs as that user. You man need to call seteuid() and setegid() as well.
Assuming that QP is a pointer to a QProcess Class | Qt Core 6.5.0[^] object then:
1. QStringList() << "-c" << command creates an array of strings which will form the second parameter of the QP->start call.
2. QP->start("/bin/sh", ... will create a shell process which reads the strings passed in via QStringList above, and executes the command string in the shell.
3. What happens next is not clear since it will depend on the actual command string, and how the start function treats the created process. The documentation should clarify.
I don't think it does. The QProcess::start method just starts the program: in this case a shell. The started program will process the information passed in via the QStringList, and then (probably) terminate. I don't use QT so I have no way of testing this. But I do not think you can call sudo or su in this way as the elevated process will be the started shell, and not your application. As I suggested in reply to your other question, you need to get the elevated privilege before starting your application.
if you pay attenti0on to the title - I asked for help with using "socket".
Well this is what you actually asked:
Member 14968771 wrote:
I am , rater naively, looking for (C/C++ no command scripts , please ) documented / commented example on how to implement Bluetooth in Linux, preferably skipping "bluez".
And that was the best example Google found for me. I have not been able to test it for you as I don't have the bluez library. But if you want to know how to use sockets directly then Google will find plenty of sample code that shows a client server implementation, e.g socket c programming - Google Search[^]. But you will still need to have a good understanding of the bluetooth transport protocol to implement it; that is why people use ready made libraries.
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
modified 3-Apr-23 12:18pm.
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